Machine tool



y 1935 L. A. DUMSER ET AL 2,002,938

MACHINE TOOL Filed March 6, 1933 5 Sheets-Sheet 1 y 28, 1935 1.. A.DUMSQ ET AL mo ms MACHINE TOOL Filed March 6, 1933 3 Sheets-Sheet 2 d aya @4 2)??? a? 5 v I 2 M y 1935- L. A. DUMSER ET AL. 2,002,938

MACHINE TOOL Filed March e, 1935 s Sheets-Sheet s Fatented May 28, 1935PATENT OFFICE MACHINE TOOL Leo A. Dumser and Oscar W. Floody, Rockford,111., assignors to Sundstrand Machine Tool 00., Rockford, 111., acorporation of Illinois Application March 6, 1

16 Claims.

This invention relates generally to machine tools and more particularlyto a machine for splitting piston ring castings.

It is an object of the invention to provide a 5 new and improved machineof simple construction adapted to produce piston rings from multiplecastings at a high rate of speed.

Another object is to provide a novel and simplified mechanism forreciprocating the work support of a machine tool.

Another object is to provide a new and improved work supporting fixtureembodying a rotating chucking device, together with means for rotatingsaid device and for operating the work clamping jaws of said deviceduring rotation.

Another object is to provide such a machine embodying a rotating cutterarbor together with a reciprocatory support having work supportingfixtures mounted on opposite sides of the arbor,

20 work chucking devices rotatably mounted on said fixtures on axesparallel to said cutter arbor and extending forwardly therefrom tofacilitate loading and unloading, means for driving said work chuckingdevices at a relatively low rate of speed,

25; means for operating the clamping jaws of said devices duringrotation, and means for recipro- -cating said support, at a traverserate during non-cutting movements thereof and at a feed rate at each endof the stroke during the cutting operation.

Further objects will become apparent from the following detaileddescription taken in connection with the accompanying drawings, inwhich:

Fig. 1 is a front elevation of a preferred form of the invention, partlyin section along the line I-l of Fig. 3.

- Fig. 2 is a fragmentary section approximately along the line 2-2 ofFig. 1.

Fig. 3 is a vertical section approximately l0, the line 3-3 of Fig. 1.

Fig. 4 is an enlarged fragmentary section along the line 4-4 of Figs. 1and 3.

Fig. 5 is an enlarged fragmentary plan view of a work supportingfixture, partly in section along the line 5'5 of Fig. 1.

Fig. 6' is an enlarged section along the line 6-4 of Fig. 5. v

, Although we have illustrated in the drawings and shall herein describein detail a preferred form of the invention, it is to be understood thatwe do not thereby intend to limit the invention to the specific form andarrangement illustrated, but intend to cover all modifications andalternative construct-ions falling within the spirit and scope of theappended claims.

along 933, Serial No. 659,744

As illustrated in the drawings, the exemplary form of the invention isembodied in a machine having a frame comprising a bed or base l and acolumn ll formed integrally therewith and extending upwardly from therear portion thereof. A tool'or cutter supporting spindle I2 isrotatably mounted in the column II, and a work support 13 is slidable onways ll which extend transversely of the spindle l2 and on the upperportion of the base In in front of the column. A cutter arbor I issuitably connected at one end to the forward end of the spindle l2 so asto be centered and driven thereby and is preferably supported at itsouter end by means of a bearing support l6 mounted on a forwardprojecting portion ll of the base III. As illustrated in Fig. 3 thearbor l5 carries a plurality of laterally spaced cutters l8. Preferablya 1v wheel I9 is mounted directly on the spindle l2 so as to preventchatter of the cutters against the work.

The spindle l2 may be arranged to be driven in any preferred manner.Inthe present form of the invention a shaft is rotatably mounted in thelower rear portion of the frame and carries a pulley 2| arranged to bedriven from a motor 22 by means of a plurality of belts 23. A shaft 24is rotatably mounted in the upper portion of the frame parallelto theshaft 20, the shafts being provided with cone pulleys 25 and 26 andconnected by means of a belt 21. The spindle I2 is herein shownconnected to the shaft 24 by means of intermeshing gears 28 and 29secured to rotate with the shaft 24 and spindle l2 respectively.Preferably an elongated idler pulley 30 is rotatably mounted on aswinging yoke 3| supported in the frame and is operable by means ofahandle 32 from the rear of the machine.

In its preferred form the invention is particularly adapted for use insplitting piston ring castings, and for this reason is shown equippedwith a pair of work chucking devices 35 and 36 which are rotatablymounted in positions parallel to the cutter arbor IS on work supportinga fixtures 31 and 38 carried on the opposite ends of the work supportl3. These chucking devices may be of the form illustrated in Fig. 5, anddescribed more fully hereinafter, and are generally adapted to carry oneor more work blanks in the form of cast rings, each one of which, duringthe operation of the machine, is split into two or more piston rings.The fixtures 31 and 38 are generally duplicates with the exception thatone is right-handed and the other lefthanded, so that a detaileddescription of one will suffice.

As illustrated herein, and most clearly in Figs. 1, 2 and 3, amember 48is slidably mounted on the support I3 and is guided for movementtransversely thereof by means of a projecting portion M on said memberengaging in a guide groove 42 in the support I3. This member is arrangedto be adjusted transversely of the work support I3 by means of a screwdevice 43 rotatably mounted in the forward portion of the support I3 andhaving threaded engagement with a nut 44 carried in a depending portion45 of the member 48. ,A casing 58, forming a frame for the fixture, hasa lower portion 5I prov vided with bevelled side edges 52 engaging ways53 extending in the member 48 longitudinally of the support I3 so as topermit of adjustment of the casing 58 longitudinally of the work supportI3. Preferably one of the ways 53 is formed on a clamping gib 54 whichforms a part of the member 48, so that the casing may be secured in itsadjusted position. If desired, adjusting screws 55 may be provided inupwardly extending lugs 56 on the end of the member 48 for the purposeof moving the casing longitudinally of said member. Clamping devices orbolts 51 (Fig. 2), are adapted to secure the member 48 to the supportI3. These bolts are operable by means of rods 58, screw threaded in theforward portion of the support and having tool receiving heads 59 (Fig.1). The rear ends of the rods extend through recesses in depending lugsI3 on the support and have pointed ends 14 enigaging conical seats I5 inthe bolts 51 with a cam action to draw the bolts downwardly.

As illustrated in Fig. 5, the chucking device 36 is rotatably mounted inthe casing 58 by means of bearings 68 and 6| and. carries a worm wheel62 intermediate the bearings, which meshes with a worm 63 secured to avertical shaft 64. The upper end of the shaft 64 projects above thecasing 58 to receive a pick-off gear 65, this gear meshing with acorresponding pick-off gear 66 carried on the upper end of an adjacentparallel shaft 61. Preferably a detachable cover plate 68 is provided toenclose these pick-01f gears. The shaft 61 extends down intov the casing58 and carries a worm wheel 69 meshing with a worm I8 which is securedto the shaft II of an electric motor, I2, this motor being secured toand movable with the casing 58. The gearing intermediate the motor andchucking device is designed to rotate the chucking device at arelatively low rate of speed. During the cutting operation in a machineof the type illustrated in the drawings the work is rotated throughtwenty-five or thirty revolutions.

' Preferably the work chucking devices rotate con- In order to enable anoperator to remove fin-- ished work pieces without stopping the motorI2, meansis provided for operating the'jaws of the chucking deviceswithout stopping the rota.-

tion thereof. As illustrated most clearly in Figs,

5 and 6, the chucking device 36 is provided with a tubular member 8.8,of resilient material, which is arranged to receive multiple piston ringcastings and is arranged to be expanded into contact with the castingsby means of a pluralityof wedge shaped jaws 8I. A tapered cylindricalactuating member 82 engages the inner surfaces of said jawsand isconnected to a rod 88 extending longitudinally through a bore in thespindle 84 of the chucking device. The rod 83 is normally urgedforwardly by means of a coiled spring 85 positioned between a collar 86on the rod 83 and a shoulder in the spindle 84. The rod 83 rotates withthe spindle and at its rear end extends through a sleeve 88 which isprovided with a transversely extending slot 89 positioned beneath therod 83 and having a beveled side wall 98. A ball thrust bearing 9| ispositioned intermediate the sleeve 88 and a flange 82 on the rear end ofthe rod 83, and a ball thrust bearing 93 is positioned intermediate thesleeve 88 and the rear end of the spindle 84. A wedge shaped actuatingmember 95 is slidably mounted in a slot in the casing 58 and extendsinto the slot 89, and is operable when moved toward the left (Fig. 5) tomove the rod 83 against the action of the spring 85 and thereby expandthe jaws 8| and tubular member 88. When the actuating member 95 is movedtoward the right (Fig.

,5) the chuck jaws are released by the action of ing to the oppositeends of the cylinder 96. The

valve device,'which may be of any preferred construction, has a pair ofpedals IM and I82 and is so arranged that when the pedal I8I isdepressed air from the supply conduit 98 is fed to the connectingconduit 99 and the connecting conduit I88 is exhausted. When the pedalI82 is depressed the pedal IN is raised and air is fed from the supplyconduit 98 to the connecting conduit I88, the connecting conduit 99being exhausted.

In the preferred form illustrated in the drawings, the work supportingfixture 38 together with its chucking device 36 and operating andcontrol mechanism is duplicated in the fixture 31 on the other end ofthe work support I3, the chucking device 35 and the operating andcontrol mechanism therefor including a second valve device 91 positionedat the lower forward edge of the base at the left-hand end thereof (Fig.1). In operation the work support I3 is arranged to be reciprocated sothat while the cutters on the arbor I5 are operating on work pieces, forexample, on the chucking device 35 as illustrated in Fig. 1, finishedwork pieces may be removed from the chucking device 36 and that chuckingdevice reloaded. The cyclic movements of the work support I3 preferablycomprise a rapid or traverse movement when no cutting is taking place,and a slow or feed movement during the 8 cutting operations. Thisresults in a rapid move- ,mentin one direction to bring the work up tothe cutters, followed by slow-feed movement dur-" ing the cuttingoperation, after wliich the work support is moved in the reversedirection at a rapid rate until the work on the other fixture isadjacent the cutters, followed by a slow feed movement. This cycle isrepeated'continuously, the time required for the cutting operationgenerally being suillcient to permit an operator to remove finished workpieces from the other.

chucking device and for reloading that device.

the shaft III.

the forward end of an adjacent parallel shaft I23 In order to obtainthis cyclic movement of the work support I3, we have provided a simpleand emcient actuating mechanism including a cam drum I I (Figs. 1 and 3)which is mounted on and splined to a shaft III rotatably mounted in thebase ,portion of the frame beneath the work support. The cam drum isprovided with a cam slot H2 in which a roller I I3, carried on the worksupport I3, engages. Thus during rotation of the cam drum the worksupport is given a reciprocatory movement as determined, by the shape ofthe slot H2. In order to increase the speed of movement of the worksupport during certain portions of the cycle, and to amplify the strokethereof beyond that obtained from the displacement of the slot H2, theinvention provides means for moving the cam drum longitudinally duringsaid portions of its rotary movement. As illustrated herein the cam drumis slidably mounted on the shaft III to which it is splined and hasasecond cam slot H4 in which a roller H5, mounted in the base I0,engages. Since the position of the roller H is fixed in the ,base itwill be apparent that upon rotation of the cam drum the drum will beforced longitudinally on The cam slots H2 and H4 are so proportioned asto obtain a rapid movement of the work support I3 during the non-cuttingmovements thereof and a slow feed movement during the cuttingoperations.

In the preferred form of the invention the cam slot H4 is provided withstraight portions H4 and H4 of substantially equal length connected bydiametrically opposite inclined portions II 4. While the roller I I5isin either of\ the straight portions of the cam slot the cam drum will ofcourse be held against longitudinal movement.

The cam slot H2 is. provided with slightly inclined or feeding portionsH2 and H2 of substantially equal length which are connected by means ofinclined transverse portions H2 and I I2. With the parts as illustratedin Fig. 1, and the cam drum H0 rotating in a clockwise direction (Fig.3) the support I3 is being fed at a feed rate toward the right byengagement of the roller H3 in the cam slot portion H2 When the rollerreaches the end of the cam slot portion I I2 and enters the portion H2the table is reversed and actuated at a higher rate of speed toward theleft (Fig. 1). Simultaneously with the entrance o f the roller H3 in thecam slot portion H2 the roller I I5 enters a cam slot portion H4whereupon the cam drum is. also moved rapidly toward the left thusaugmenting the movement of the work support. When the roller H3 hasreached the beginning of the cam slot portion I I2" and theroller H5 isabout to enter the cam slot portion H4 the work support I3 has beenmoved to a position wherein the cutters I 8 are about to engage the workblanks carried on the chucking device 36. The slow feed movement of thework support toward the left isthen commenced with the roller H5 ridingin the straight portion H4 of the cam slot H4 and the roller H3 engagingin the feed portion II 2 of the cam slot H2. The reversing and returnmovements are repeated at the end of each feeding movement.

The cam shaft I H may be driven in any preferred manner. As illustratedherein this shaft carries a worm wheel H8 which meshes with a worm H9can'ied on a shaft I20. The front end of the shaft I20 is splined forthe reception of a pick-ofi' gear I2I which meshes witha correspondingpick-01f gear I22 similarly splined on (Fig. 4). The rear end of theshaft I23 is reduced insize and is rotatably mounted in the forward endof a coaxial shaft I24 by means of a sleeve bearing I25. The shaft I24carries a sprocket I26 which is driven from a. sprocket I 21 (Fig. 3) 0nthe spindle I2, by means of a suitable chain (not shown). to the coaxialshaft I24 a toothed clutch member I29 is splined on the shaft I23 andhas teeth en-' gageable with a complementary clutch member I30 pinned tothe adjacent end of the shaft I24. The clutch member I29 has aperipheral groove I3I and is operable by means of a handle I32 (Fig. 1)mounted on ashort shaft I33 which carries an eccentric pin I34 engagingin the slot I3 I. In using the machine an operator may start the mainmotor 22 after having loaded both chucking devices with work blanks. Thework 'fixture motors 12 are also started, and the feeding mechanism forthe work support I3 is placed in operation by engaging theclutch'members I29 and I30. The work support will then move in onedirection (for example, toward the right in Fig. 1), at a rapid rateuntil the work pieces on the fixture 31 are about to engage the cuttersI8,-

whereupon the speed of the support is reduced to a feed rate, andcontinues at that rate during the cutting operation. When the cuttingoperation is completed the work support I3 is returned at a rapid ratein order to engage the cutters with the work blanks on the otherchucking device 36.

In order to connect the shaft I23 As soon as the work on chucking device35 has receded from the cutters sufficiently the operator, by depressingthe inner treadle IOI of the left-hand valve 91 (Fig. 1) releases thefinished work pieces from said chucking device, and practicallysimultaneously with the operation of the valve by his foot, theoperators hands are available for removing the finished work pieces andreloading the chucking device with work blanks. The treadle I02 of thesame valve is then operated to clamp the new work pieces to thechucking'device. This operation is repeated after each feeding movementof the work support, the provision of foot operated means forcontrolling the releasing and clamping of the work pieces leaving theoperator's hands free for removing finished work pieces and replacingthem with work blanks. During this operation the chucking devicescontinue to rotate at a relatively low speed.

As will be apparent, and particularly from Fig. 3, the cutters III-arepositioned on the arbor- IS in front of the work support I3 and abovethe forwardly extending portion II oi?v the base, which is hollow.Preferably a drain pipe I40 is provided connecting the lower end of thisportion of the base with a coolant reservoir I4I formed in the lowerportion of the base and a removable pan I42 is positioned in an openingI43 immediately beneath the cutters to prevent foreign matter frompassing with the cutter coolant back into the base.

We claim as our invention: 1. A machine comprising, in combination, aframe, an arbor rotatably mounted on said frame, a work support movabletransversely on said frame beneath said arbor, means for reciprocatingsaid work support at feed and traver'se rates including means for movingthe support at a feed rate prior to its reversal at each end of itsstroke, a pair of work chucking and rotating fixtures on said supportone on each side of said arbor. each comprising a holder and a workchucking device rotatably mounted on the holder on an axis parallel withsaid cutter arbor and in overhung relation thereto so as to facilitatereplacing finished work pieces with work blanks, means for driving saidchucking device at a relatively low speed, and means for clamping workpieces to said chucking devices and .for releasing said work piecestherefrom during continued rotation of the chucking devices comprisingpiston and cylinder devices on said-fixtures, and control valves forsaid piston and cylinder devices having operating pedals positioned onthe front of said frame adjacent to the bottom thereof and arranged tobe foot operated.

2. A machine comprising, in combination, a frame, an arbor rotatablymounted on said frame, a work support movable transversely on saidframe, means for reciprocating said work support at feed and traverserates including means for moving the support at a feed rate prior to itsreversal at each end of its stroke, a pair of work chucking and rotatingfixtures on said support one on each side of said arbor, each comprisinga work chucking device rotatably mounted on an axis parallel with saidcutter arbor and extending forwardly from the work support in overlyingrelation to the front portion of the frame to facilitate loading andunloading, means for driving said chucking device at a relatively lowspeed, and means for clamping work pieces to said chucking devices andfor releasing said work pieces therefrom during continued rotation ofthe chucking devices comprisll'lgdIlOtGl devices on said fixtures, andcontrol devices for said motor devices positioned in laterally spacedrelation on the front of said frame adjacent the bottom thereof andhaving pedals arranged to be foot operated.

3. A machine tool comprising, in combination, a base, a column uprisingfrom the rear portron of said base, a table slidably mounted on theforward portion of said base for movement transversely in front of saidcolumn, a spindle rotatably mounted in said column 011 a horizontal axisextending transversely of said table, a work supporting fixture mountedon each end of said table and on opposite sides of a saw arbor supportedby said spindle, each fixture comprising a housing, a work chuckingdevice rotatably mounted on an axis parallel to said spindle andextending forwardly from the housing, a motor supported from saidhousing and movable therewith, gearing intermediate said motor and workchucking device including pickoif gears readily accessible from theoutside of said housing, and means for actuating the work clamping meansof said chucking device includmg a piston and-cylinder device carried onsaid housing, means for reciprocating said table, and means forcontrolling the movements of said table.

4. A machine comprising, in combination, a frame, a work support movablymounted on said frame, and means for reciprocating said support at feedand traverse rates comprising a driven shaft rotatably mounted on saidframe beneath said work support, a cam drum splined to and slidable onsaid shaft, a follower on said work support engaging in a slot in saiddrum so as to reciprocate the support during rotation of the drum, andmeans for reciprocating the cam drum longitudinally on said shaft toaugment the movement of the support during certain portions of itsstroke comprising a follower mounted on said frame engaging a secondslot in said drum.

5. A machine comprising, in combination, a frame, a work support movablymounted on said frame, and means for reciprocating said support at feedand traverse rates comprising a driven shaft rotatably mounted in saidframe, a cam on said shaft, a follower on said work support engagingsaid cam so as to reciprocate the support during rotation of the cam,and means for reciprocating the cam bodily during its rotation toaugment the movement of the support during certain portions of itsstroke.

6. A machine comprising, in combination, a frame, a support movablymounted on said frame, and means for reciprocating said support at feedand traverse rates comprising a driven shaft rotatably mounted on saidframe, a cam drum splined to and slidable on said shaft, a follower onsaid support engaging in a cam slot in said drum so as to reciprocatethe support during rotation of the drum, and means for reciprocating thecam drum longitudinally of said shaft to modify the movement of thesupport during certain portions of its stroke comprising a followerfixed on said frame engaging a second cam slot in said drum.

7. A machine comprising, in combination, a frame, a support movablymounted on said frame, and means for reciprocating said support at feedand traverse rates comprising a driven shaft rotatably mounted on saidframe, a cam drum on said shaft, a follower on said support engaging ina cam slot in said drum so as to reciprocate the support during rotationof the drum, and means for reciprocating the cam drum longitudinally ofsaid support to modify the movement of the support during certainportions of its stroke comprising a follower mounted on said frameengaging a second cam slot in said drum.

8. A machine tool comprising, in combination, a base, a column uprisingfrom the rear portion of said base, a table slidably mounted on saidbase for movement transversely in front of said column, a spindlerotatably mounted in said column on a horizontal axis extendingtransversely of said table, a cutter arbor mounted on said spindle andextending forwardly over the table, said base having a hollow portionprojecting in front of the table, means on said hollow portion forsupporting the forward end of said arbor, a work supporting fixturemounted on each end of said table and on opposite sides of said arbor,each fixture having a rotatably mounted work chucking device extendingforwardly therefrom over the hollow portion of said base, means forrotating said work chucking devices, and means for reciprocating saidtable.

9. A machine tool comprising, in combination, a base, a column uprisingfrom the rear portion of said base, a table slidably mounted on theforward portion of said base for movement transversely in front of saidcolumn, a'tool support rotatably mounted in said column on a horizontalaxis and extending forwardly over the table, said base having a hollowportion projecting in front of the table to receive the tool coolant andto support the forward end of the tool support, a work supportingfixture mounted on one end of said table having a rotatably mounted workchucking device extending forwardly therefrom over the hollow portion ofsaid base, means for rotating said work chucking device, and means forreciprocating said table.

10. A piston ring splitting machine comprising, in combination, a base,a column uprising from the rear portion of said base, a table slidablymounted on said base for movement transversely in front of said column,a tool support rotatably mounted in said column on a horizontal axis andextending forwardly over the table, a pair of work supporting fixturesmounted on said table on opposite sides of said tool support, eachfixture having a rotatably mounted work chucking device extendingforwardly therefrom in overhanging relation adjacent to the forward sideof the base to facilitate loading multiple piston ring castings thereon,means for rotating said work chucking j devices, and means forreciprocating said table.

11. A machine tool comprising, in combination, a base, a column uprisingfrom the rear portion of said base, a table slidably mounted on said Ibase for movement transversely in front of said column, said base havinga hollow portion open at the top projecting forwardly in front of saidtable, a spindle rotatably mounted in said column on a horizontal axisextending transversely of said table, a cutter arbor mounted on saidspindle and extending forwardly over the table and the hollow portion ofthe base, a work supporting fixture on said table on each side of saidarbor, each fixture having a rotatably supported spindle carrying a workchucking device projecting over the hollow portion of said base, meansfor rotating said devices, and means for reciprocating the table.

12. A machine comprising, in combination, a frame, a support movablymounted on said frame, and means for reciprocating said supportcomprising a driven shaft mounted adjacent to said support, a cam drumsplined to and movable longitudinally of said shaft, a follower on saidwork support engaging a slot in said drum so as to reciprocate thesupport during rotation of the drum, and a second cam and followerdevice one part of which is mounted on said frame and the other on saiddrum arranged to shift the drum longitudinally of the shaft whereby toaugment the movement of the support in certain portions of its stroke.

13. A machine comprising in combination, a frame, an arbor rotatablymounted on said frame, a work support movable transversely on said framebeneath said arbor, 'means for reciprocating said work support at feedand traverse rates including means for moving the support at a feed'rateprior to its reversal at each end of its stroke, a pair of work chuckingand rotating fixtures on said support, one on each side of said arbor,each comprising a housing and a work chucking device rotatably mountedon said housing on an axis parallel with said cutter arbor. and having awork carrying portion projecting forwardly from said housing inoverhanging relation to the front edge of the machine so that workpieces may be readily chucked, means for driving said chucking device ata relatively low speed, and means for clamping work pieces to saidchuckingdevices and for releasing said work pieces therefrom duringcontinued rotation of the chucking devices including control devicespositioned on the front of the machine adjacent the ends thereof wherethey are readily actuated while work pieces are being chucked.

said bed, an arbor rotatably mounted in said column and projecting overthe front portion of said bed, a work support mounted on the frontportion of said bed, movable transversely beneath said,

, arbor, means for reciprocating said work support K at feed andtraverse rates, a pair of work chucking and rotating fixtures on saidsupport, one on each side of said arbor, each fixture comprising ahousing and a work chucking device rotatably mounted on said housing onan axis parallel with said cutter arbor and having a work carryingportion projecting forwardly from said housing beyond said work supportand in overlying relation to'the forward edge of said bed within easyreach of an operator standing at the front of the machine, means fordriving said chucking device at a relatively low speed, and means forclamping said work pieces to said chucking devices and for releasingsaid work pieces therefrom during continued rotation of the chuckingdevices including control devices positioned on the front of said bedadjacent the ends thereof.

15. A machine comprising in combination, a frame, an arbor rotatablymounted on said frame and projecting to the forward edge thereof, a worksupport movable transversely on said'frame beneath said arbor, meansforreciprocating said work support at feed and traverse rates; a pair ofwork chucking and rotating fixtures on said support, one on each side ofsaid arbor, each fixture comprising a housing and a work chucking devicerotatably mounted on said housing on an axis parallel with said arbor,means for driving said chucking device at a relatively low speed, andmeans for clamping work pieces to said chucking devices and forreleasing said work pieces therefrom during continued rotation of thechucking devices including control devices positioned on the front ofsaid frame adjacent the ends thereof, each of said chucking devicesbeing journaled only intermediate its ends and having a work carryingportion projecting forwardly from said housing beyond said work supportand in overlying relation to the front portion of said frame forconvenient replacement of work by'an operator standing at the front ofthe machine adjacent the control devices for the chucking devices.

16. A machine tool comprising in combination, a frame, an arborrotatably mounted on said frame, a'motor for rotating said arbor, atable slidably mounted on said frame transversely beneath said arbor,means for reciprocating said table at feed and traverse rates, a. worksupporting fixture mounted on each end of said table and on oppositesides of said arbor, each fixture comprising a housing, a work chuckingdevice rotatably mounted on an axis parallel to said arbor, a firstmotor supported from said housing operatively connectedto rotate saidchucking device and a second motor supported from said housing andmovable therewith operatively connected for actuating the work clampingmeans of said chucking device and means for controlling said secondmotor independentlyof said other motors.

LEO A. DUMSER. OSCAR w. FLOODY.

